MPEG2 4:3 / 16:9 flag

[mats.hogberg]

Somewhere I found a doc describing a flag in the mpeg2 header, that determines if the mpeg is to be displayed as 4:3 or 16:9. Now, I've f*cked up again, and encoded a 16:9 movie with 4:3 aspect ratio. Can anyone refresh my memory as to where in the header this is, and the values for the different ratios? It's a simple thing to alter with a hex editor - much easier than reencoding...

TIA!
/Mats

[AngusMacGyver]

Hi!
Pulldown.exe can change aspect ratio.
Try it.

[Baldrick]

or
DVDPatcher
or
Restream

[mats.hogberg]

Thanks guys! Actually found the page where I first found the info:

Open the video stream (m2v) in HexEditor,
Locate the sequence header 00 00 01 b3 (usually hex address 000)
Make changes as need, then save.


0000000: 00 00 01 B3 1E 01 E0 24 00 00 00 00 00 00 00 00

Horizontal Size in Hex
16 0 = 352
1E 0 = 480
2D 0 = 720
2E 4 = 740
Vertical Size in Hex
0F 0 = 240
1E 0 = 480
Aspect Ratio
1 = 1:1
2 = 4:3
3 = 16:9
4 = 2.211 (not used in dvd)
Frame Rate
1 = 23.976
2 = 24
3 = 25
4 = 29.97
5 = 30
6 = 50
7 = 59.94
8 = 60

/Mats

[vhelp]

Hay guys

@ mats.hogberg..

That is great. I too am having my own issues w/ 16x9 views and things.

I'd like to expand on this, and develop a tiny app that will do this for ya
(and others) and I was wondering about cooking up something real quick
under Delphi. If its something soo simple, I could crack something up right
away ?? (PM me, so this topic doesn't become traffic junk)

Thanks for any info,
-vhelp